//- 获取数组内容, 索引; 字典中的 键值对
//- for = each
//- for val, i in [1, 2, 3]; 索引在后面
ul
    each val in [1, 2, 3, 4, 5]
        li= val
ul
    each val, index in ['zero', 'one', 'two']
        li= index + ': ' + val
ul
    for val, index in {1:'one',2:'two',3:'three'}
        li= index + ': ' + val

//- while
- var n = 0
ul
    while n < 4
        li= n++
